Colloidally prepared La-doped BaSnO3 electrodes for efficient, photostable perovskite solar cells

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Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO2) as an electron-transporting layer. However, TiO2 can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO3 (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500 degrees C. We report a superoxide colloidal solution route for preparing a LBSO electrode under very mild conditions (below 300 degrees C). The PSCs fabricated with LBSO and methylammonium lead iodide (MAPbI(3)) show a steady-state power conversion efficiency of 21.2%, versus 19.7% for a mp-TiO2 device. The LBSO-based PSCs could retain 93% of their initial performance after 1000 hours of full-Sun illumination.
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Issue Date
2017-04
Language
English
Article Type
Article
Citation

SCIENCE, v.356, no.6334, pp.167 - 171

ISSN
0036-8075
DOI
10.1126/science.aam6620
URI
http://hdl.handle.net/10203/282748
Appears in Collection
CBE-Journal Papers(저널논문)
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